It's because of jokes he's made about Hurricane Katrina.
Besides riding on one of the parade's 35 floats, Mencia had been scheduled to perform at the Orpheus ball after the parade.
Meantime, Joan Rivers has been added to the list of celebs.
That list also includes Jim Belushi, "Mad Men" co-star Bryan Batt, former "American Idol" contestant Josh Gracin, Christian LeBlanc of "The Young and the Restless," Ricky Paull Goldin of "All My Children" and the cast of "Reno 911."
The Krewe of Orpheus parade is February 23rd.
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